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### fee_file.pl
use strict;
...
__END__
Produces the warning message:
Name "main::fee" used only once: possible typo at ...

### foo_file.pl
use strict;
...
Produces the warning message:
Name "main::fee" used only once: possible typo at ...

### perl
$foo = 1;

### python
foo = 1

### perl
print "Hello $foo."         ### 19 chars

### python
print "Hello "+foo+".",     ### 23 chars